An off-duty police officer saved the life of a woman with cancer who was too exhausted from treatment to flee gunfire at the mass shooting in Las Vegas. Cassidy Huff, who had recently finished a course of chemotherapy and was at the Route 91 festival with her mother, collapsed behind a car when she tried to run. Officer Mitchell Tosti, a member of the Los Angeles Police Department who was at the festival with his fiancee and friends, spotted Ms Huff and carried her to safety.